Manafort and Gates were told to surrender to authorities by lawyers working with special counsel Robert Mueller. Mueller has been investigating Manafort for his financial ties to a pro-Russia party in Ukraine, and his Virginia home was the subject of an FBI search this summer. The case was unsealed Monday after they surrendered.

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Manafort makes his way through television cameras as he walks from Federal District Court in Washington on Oct. 30, 2017. He pleaded not guilty to felony charges of conspiracy against the United States and other counts. Alex Brandon, AP

Manafort, left, leaves his home in Alexandria, Va., on Oct. 30, 2017. A federal grand jury has charged Manafort and his business and campaign associate Rick Gates with 12 counts — including conspiracy, money laundering, failing to register as foreign agents, and making false statements. Andrew Harnik, AP

Manafort takes in game four of the Major League Baseball American League Championship Series playoffs between the New York Yankees and the Houston Astros at Yankee Stadium in New York on Oct. 17, 2017. Justin Lane, European Pressphoto Agency

Manafort speaks on the phone while touring the floor of the Republican National Convention at the Quicken Loans Arena as final preparations continued on July 17, 2016, in Cleveland. Win McNamee, Gett Images

Manafort speaks with Ben Carson as they arrive for a Trump for President reception with guests during the Republican National Committee spring meeting at the Diplomat Resort on April 21, 2016, in Hollywood, Fla. Joe Raedle, Getty Images